diff --git a/src/oatpp/core/async/Coroutine.cpp b/src/oatpp/core/async/Coroutine.cpp
index 1d44acf0..dba19f8c 100644
--- a/src/oatpp/core/async/Coroutine.cpp
+++ b/src/oatpp/core/async/Coroutine.cpp
@@ -174,7 +174,7 @@ Action CoroutineStarter::next(Action&& action) {
   Action result = m_first;
   m_first = nullptr;
   m_last = nullptr;
-  return std::move(result);
+  return result;
 }
 
 CoroutineStarter& CoroutineStarter::next(CoroutineStarter&& starter) {
diff --git a/src/oatpp/core/async/Coroutine.hpp b/src/oatpp/core/async/Coroutine.hpp
index 045d6bbe..6c67aca4 100644
--- a/src/oatpp/core/async/Coroutine.hpp
+++ b/src/oatpp/core/async/Coroutine.hpp
@@ -690,7 +690,7 @@ public:
       m_coroutine->m_callback = (FunctionPtr)(callback);
       Action result = m_coroutine;
       m_coroutine = nullptr;
-      return std::move(result);
+      return result;
 
     }
 
diff --git a/src/oatpp/parser/json/mapping/Deserializer.cpp b/src/oatpp/parser/json/mapping/Deserializer.cpp
index f6128339..6f2d5a15 100644
--- a/src/oatpp/parser/json/mapping/Deserializer.cpp
+++ b/src/oatpp/parser/json/mapping/Deserializer.cpp
@@ -122,7 +122,7 @@ Deserializer::AbstractObjectWrapper Deserializer::readInt32Value(oatpp::parser::
   if(caret.isAtText("null", true)){
     return AbstractObjectWrapper(Int32::ObjectWrapper::Class::getType());
   } else {
-    return AbstractObjectWrapper(Int32::ObjectType::createAbstract((int)caret.parseInt()), Int32::ObjectWrapper::Class::getType());
+    return AbstractObjectWrapper(Int32::ObjectType::createAbstract((const int)caret.parseInt()), Int32::ObjectWrapper::Class::getType());
   }
 }
 
diff --git a/src/oatpp/web/protocol/http/Http.cpp b/src/oatpp/web/protocol/http/Http.cpp
index 507c5eac..0507d668 100644
--- a/src/oatpp/web/protocol/http/Http.cpp
+++ b/src/oatpp/web/protocol/http/Http.cpp
@@ -298,8 +298,8 @@ void Parser::parseResponseStartingLine(ResponseStartingLine& line,
     error = Status::CODE_400;
     return;
   }
-  
-  line.statusCode = (int)caret.parseInt();
+
+  line.statusCode = (v_int32)caret.parseInt();
 
   auto descriptionLabel = caret.putLabel();
   if(caret.findRN()){
diff --git a/src/oatpp/web/protocol/http/outgoing/DtoBody.cpp b/src/oatpp/web/protocol/http/outgoing/DtoBody.cpp
index 70dda5da..d5556ca8 100644
--- a/src/oatpp/web/protocol/http/outgoing/DtoBody.cpp
+++ b/src/oatpp/web/protocol/http/outgoing/DtoBody.cpp
@@ -52,4 +52,4 @@ void DtoBody::declareHeaders(Headers& headers) noexcept {
   }
 }
 
-}}}}}
\ No newline at end of file
+}}}}}
diff --git a/test/oatpp/core/data/stream/ChunkedBufferTest.cpp b/test/oatpp/core/data/stream/ChunkedBufferTest.cpp
index fd0fdf1a..1cd90590 100644
--- a/test/oatpp/core/data/stream/ChunkedBufferTest.cpp
+++ b/test/oatpp/core/data/stream/ChunkedBufferTest.cpp
@@ -116,7 +116,7 @@ void ChunkedBufferTest::onRun() {
       OATPP_ASSERT(oatpp::String((const char*)&wholeText->getData()[i], substringSize, false) == stream.getSubstring(i, substringSize));
     }
 
-    substringSize = ChunkedBuffer::CHUNK_ENTRY_SIZE * 2;
+    substringSize = (v_int32) ChunkedBuffer::CHUNK_ENTRY_SIZE * 2;
     for(v_int32 i = 0; i < wholeText->getSize() - substringSize; i ++) {
       OATPP_ASSERT(oatpp::String((const char*)&wholeText->getData()[i], substringSize, false) == stream.getSubstring(i, substringSize));
     }
@@ -126,4 +126,4 @@ void ChunkedBufferTest::onRun() {
 
 }
 
-}}}}}
\ No newline at end of file
+}}}}}